Outdated instructions for compiling on Arm64 Linux

[dennisameling]

Your website has a page with instructions for compiling on Arm64 Linux: https://v8.dev/docs/compile-arm64.

However, I'm stuck at the "Compiling Clang" section on Ubuntu 22.04 arm64.

First of all, the build command seems to be outdated. The --gcc-toolchain argument seems to be no longer supported on this build command:

usage: build.py [-h] [--bootstrap] [--disable-asserts] [--host-cc HOST_CC] [--host-cxx HOST_CXX] [--pgo] [--thinlto] [--bolt]
                [--llvm-force-head-revision] [--run-tests] [--skip-build] [--skip-checkout] [--build-dir BUILD_DIR] [--install-dir INSTALL_DIR]
                [--no-tools] [--extra-tools [EXTRA_TOOLS ...]] [--no-runtimes] [--use-system-cmake] [--tf-path TF_PATH]
                [--with-ml-inliner-model WITH_ML_INLINER_MODEL] [--with-android [WITH_ANDROID]] [--pic] [--with-fuchsia [WITH_FUCHSIA]]
                [--without-android] [--without-fuchsia] [--with-ccache] [--without-zstd]
build.py: error: unrecognized arguments: --gcc-toolchain=/usr

When I take it out, the build starts, but fails at some missing Python wheels:

Building final compiler.
[E2025-02-14T08:40:29.409888+01:00 196214 0 builder.go:223]
Errors:
  failed to resolve infra/python/wheels/h5py/linux-arm64_cp38_cp38@version:3.11.0 (line 13): no such tag
  failed to resolve infra/python/wheels/libclang/linux-arm64_cp38_cp38@version:18.1.1 (line 18): no such tag
  failed to resolve infra/python/wheels/ml_dtypes/linux-arm64_cp38_cp38@version:0.2.0 (line 21): no such package: infra/python/wheels/ml_dtypes/linux-arm64_cp38_cp38
  failed to resolve infra/python/wheels/numpy/linux-arm64_cp38_cp38@version:1.22.1 (line 22): no such tag
  failed to resolve infra/python/wheels/scipy/linux-arm64_cp38_cp38@version:1.10.1 (line 32): no such tag
  failed to resolve infra/python/wheels/tensorflow-io-gcs-filesystem/linux-arm64_cp38_cp38@version:0.34.0 (line 38): no such tag
  failed to resolve infra/python/wheels/tensorflow/linux-arm64_cp38_cp38@version:2.12.0 (line 39): no such tag
  failed to resolve infra/python/wheels/wrapt/linux-arm64_cp38_cp38@version:1.14.1 (line 45): no such tag
2025/02/14 08:40:29 exit status 1

failed to generate venv derivation: failed to build package: wheels+7gi17i3vnd5hmhqsb007h09uj8: failed to execute builder: exit status 1
Traceback (most recent call last):
  File "/home/dennis/repos/v8/v8/./tools/clang/scripts/build.py", line 1596, in <module>
    sys.exit(main())
  File "/home/dennis/repos/v8/v8/./tools/clang/scripts/build.py", line 1439, in main
    tf_path = subprocess.check_output(
  File "/usr/lib/python3.10/subprocess.py", line 421, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.10/subprocess.py", line 526, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['vpython3', '/home/dennis/repos/v8/v8/tools/clang/scripts/get_tensorflow.py']' returned non-zero exit status 1.
-- timers --
 checkout llvm:  7.0
  get sysroots:  0.0
 libxml2 build: 47.3
    zstd build: 29.4
get tensorflow:  1.7

build-log.txt

Do you have any guidance as to how I could get things to compile correctly? Happy to contribute wherever needed.